The guaranteed drop guide lacks a method for Yang's dungeon (which is extremely boring and tedious with all those encounters!), so I set out to find one and I think I got one.
- Save at the Fabul Inn right beside Challengingway - Reset and load. - As soon as the game is loaded, hold dash and go two squares upward. - Then, dash all the way to the left through the inn beds. - As soon as you reach the left wall, dash right until you reach above Challengingway. - Dash down and talk to Challengingway to enter the dungeon. - Now, you may do whatever you want inside. The final chest will contain a good treasure.
I hope this method is a legit one, as in I didn't get the good treasures by dumb luck. Less X-potions, more good gears!
This was tested in waning moon, but it probably works in other moons.
- Save at Fabul Inn - Reset and load the save - Do the following with as few steps as possible: > exit the inn > take the stairs upward > take the door downward and go out > take the door right of you into the east tower - If you did the previous step correctly, the monk in red pants should walk down, left, up, and right (returning to where he was initially). As that monk walks right, quickly get out of the east tower. - Go back to Challengingway with as few steps as possible. - Talk to him and enter the dungeon. Whatever you do inside should not matter.
* The number of steps seem to matter, but the exact path of your travel does not matter. * Tested on waning and new moon